Apparatus for cutting spiral grooves in grooved rolls



APPARATUS FOR CUTTNG SPIIRAL GROOVES IN GROOVED ROLLSy idf/@maa Feb. 245, 1947. w, T.' FlELDs ErAL 2,416,518

APPARATUS FOR CUTTING SPIRAL GRoovEs IN GRoovED RoLIfsy Filed July 22, 1944 2 Sheets-Sheet FIGA-, v f 15' l i I /ff' #i Inu/07250715* Patented Feb;y 259 1547 -l UNITED William APPARATUS Foa CUTTING sPntL GRoovEs IN Gnoovan aoLLs T. Fields, Pittsburgh, and Edgar M. D. f' Herold, Duquesne, Pa.

Application July 22, 1944, Serial No. 546,148

i claim. (el. lao-'20) This invention relates to rolling mill rolls and, l

particularly, to an improved apparatus for cutf ting spiral grooves in the grooves of rolling mill rolls, this application beingl a continuation-inpart of our prior application Serial No. 472,264, filed January 13, 1943. j

Forthe purpose of reinforcing concrete, it is customary to use reinforcing bars or rods which are imbedded in the concrete. It is desirable that such -rods and bars have lugs, ribs, offsets, etc. formed on the surface thereof so that they will be more effective in their use and'they are usually rolled to.shape by means of a rolling mill. To produce such reinforcing rods and bars in arolling mill, it will be seen that it is not only necessary to provide rolls having grooves arranged around the yperiphery thereof in order to form the roll passes but it is also necessary that proper. shapes y be formed'in the Igrooves of the roll in order to form the desired lugs, ribs, or other configurations on the finished reinforcing rods and bars.

It has been found that a cylindrical bar or rod having radially extending double spiral lugs arranged throughout the length thereof `is most desirable for the purpose of reinforcing concrete,

and it is to a roll for rolling such -bars or rods thatv the present invention relates.

In order to produce a reinforcing bar or rod having such double spiral lugs arranged thereon continuously by rolling in a rolling mill, it' will be readily apparent that it is necessary that there be formed in the grooves of the rolls of the mill, a plurality of double' spiral grooves in the periphery of the grooves with such` spiral grooves being spaced equi-distant apart. Heretofore, it has not been possible to cut such spiral grooves in the grooves of the rolling mill rolls bymeans of a con. ventional type milling. machine or by any other 2 in a. minimum amount l Y f time with the least amount of effort,

Various other object-s and advantages of this invention will be more apparent in thecourse of the .following specication and will be particularly pointed outl in the appended'claim.

AIn the accompanying drawings there is shown,`

for the purpose lof illustration, an4 embodiment known machine. It will be seen that it would be impractical to cut such spiral grooves in the'roll by hand as such procedure would be laborious as Well as expensive, and considering the life of such ya roll would be prohibitive. l

Accordingly, it is the general object of the present invention to provide an improved apparatus for cutting spiral groovesl in the grooves of rolling mill rolls which are efficient and effective in their use, so as to provide rolls which will vform effectively the desired lugs on the finished reinforcing bar or rod product. f

It is another object of the invention to provide an improved apparatus for cutting spiral grooves in the grooves of rolling mill rolls which is simple and inexpensive in construction and use, and, by which, the spiral grooves can be cut in the rolls which our invention may assume in practice.

In these drawings:

Figure lis a plan view of the improved appara.- u

tus of our invention showing it incorporated with a conventional type milling machine; l

Figure 2 is a front elevational view thereof; Figure 3 is a side elevational view of the same; Figure 4 is a plan view of a portion of one of the grooves in a roll showing the initial cutting of double spiral groovesl in the groove of the roll`;' Figure 5. is a plan view similar. to Figure 4 showing the double spiral grooves out in the groove of a roll after the cutting operation has been completed; 4

Figure `6 is an vend view of the cutter showing double spiral grooves being cut in a roll;

Figure 'i is a iongitudmai section through the v opposed grooves which form the roll pass of a pair. of rolls showing the spiral groovesA formed therein;

Figure 8 is a plan'view of a portion of a reinforcing baror rod to be formed by passing through the groove or; roll pass of the rolls as shown in Figure '7;

Figure 9 is a plan view ofa portion of a rein,-k

forcing bar or 4rod as shown in Figure 8 with the bar turned 90 degrees from ythe position as and an `adjustable table '4 which is adapted to support the Work-.piece There'is carried bythe columnv 3, a rotatable arbor 5 and a, pair of horizvontally extending supporting members 6 upon which there is mounted a bracket member l in whichthe outer end of the arbor Slis journaled.

the groove of drawings, Y

bracket member 9 mounted on the column 3 of degrees apart, i. e., diametrically opposed. It will Y the milling machine and on the inner end of be understood that if single spiral grooves are `the shaft there is positioned a bevel gear `Il) adapted to be cut in the grooves of the roll, a cut- `which meshes with a similar bevel gear I2 securely ter having one tooth is used and if it is desired to mounted on the arbor 5. At the opposite end cut triple spiral grooves in the roll grooves,.a cutof the shaft 8, there is arranged a conventional ter having three teeth is used.

`time gear reducer I3 having trunnions I4' by As'shown in the drawings, the cutter teeth 32 Iwhich it is rotatably supported. The trunnions have transverse cutting profiles correspondingv to.

`are journaled in the upper end of a trunnion the cross-section-of the spiral'grooves 36 to be stand I5 which-is. positioned on the floor to one l0 out thereby, and have a constant maximum radius `side of the milling machine. One of the shafts equal to the maximum radius of said spiral I6 of the gear reducer I3 fis connected to the grooves.

outer end of the shaft 8 preferablyby means of The apparatus of our invention functions in the `a. coupling I'I. following manner. It -wil1 be understood that the On top of the adjustable table 4 of the milling 15 roll 29I vto be worked upon is circumferentially machine, there is arranged an adjustable journal grooved as at 30 vprior to the formation of the bracket member I8, preferably having a floating spiral grooves thereon by means of the present `bearing element I9 carried thereby. The bracket apparatus. The grooved work roll 29 is mounted I8 is preferably bolted to. the `top of the tablev 4 and so arranged that it may be loosened there- 20 the milling `machine so that one of the grooves on the bearings 21 on top of the work table 4 of `from so that the bracket may be 'adjusted end- 39 in the roll is positioned below the cutter 3|, as

wise of the table for a purpose hereinafter to be shown in Figures 1 and 2 of the drawings. described. There is arranged through the bear- The coupling or wabbler 26 on the end of the ing element I9, preferablyk a square shaft shaft 20 is then positioned over the end of the roll which extends substantially parallel to the shaft and the bracket I8 is properly adjusted on the 8. lOn the outer end of the shaft 20, there is table 4 and secured in place on the table. The

lmovably arranged a bevel gear 2| which meshes milling machine is then set in operation and upon witha similar bevel gear 22 disposed on theouter rotation of the arbor 5 together with thev cutter, end ofthe slow speed shaft 23 of' the speed 3I carried thereby, the work roll 29 will be rotated `reducer I3, shaft 23 being supported in a suitable 30 by the apparatus of our invention in a manner bearing 24. I p hereinbefore described. The table 4 together with The gear 22 is prevented from rotating on the the work roll 29 carried thereby, is then moved shaft 23, preferably by means of splines which upwardly by means of the usual screw adjustment lpermit the shaft to move endwise through the 3l provided on such milling machines, the proper `bevel gear 22. To prevent undue rotation of the 35 distance in order that the teeth 32 ofthe cutter gear reducer I3, there is provided preferably a "3| will make the proper initial cut in the periph- `striking plate or stops 25 which are disposed on ery of the groove 30 being cut, as shown in Figure `each side of the stand I5and preferably attached 4 of the drawings. It will be seen that if a to the base of the gear reducer, as shown in two tooth cutter is used, as in the present instance,

`Figures 2 and 3 ofthe drawings. 40 that the teeth `will cut double spiral grooves 36 in A wabbler or coupling 26 is adapted to t over the groove 30 of the roll upon rotation of the cutland around the end of the work roll, the said ter and the work roll. The initial cutting ofthe wabbler being connected to the shaft 20 by a spiral grooves 3-6 in the groove of the roll is con- `universal joint 26a. There is also mounted on tinued until the spiral grooves have been initially top of the table 4 of the milling machine, a pair 45 cut entirely in the groove around the periphery of adjustable spaced apart bearing members 21 of the roll. After the first or initial cut has been in which the necks 28 of aroll 29 are journaled. made entirely around the groeve, the table 4 tovThe bearing members 21 `are held in position on gethe'r with the work roll 29 is moved upwardly `the top of the table 4 preferably by means of so that the spiral grooves 36 will be cut deeper by bolts extending into the table. 50 the cutter 3|. This procedure is followed until By providing such an arrangement, it will be y the spiral grooves 36'are cut to the desired depth `seen that upon rotation of the arbor 5 of the in the groove of the roll, as shown in Figure 5 of milling machine theroll 29 will be rotated by the the drawings. l After the spiral grooves 36 havev `action 0f the bevel gears l0 and l2, the Shaft 8, been cut -in one of the grooves ofthe roll, it will the geel' reducer I3, the bevel gears 2| and 22, 55 be understood that the next groove and each suc. the shaft 26 and the coupling or wabbler 26. ceeding groove thereafter is disposed below the It will be understood that the above described cutter 3| and the spiral grooves 36 cut thereon apparatus is provided primarily for cutting spiral until all of they grooves 3l) have spiral grooves grooves in the grooves of afrolling mill roll. Such formed therein of the work roll. In order to disa roll is shown positioned in the milling machine pose the respective grooves 30 below the cutter 3l,

in position to be machined and there is arranged the table 4 of the milling machineis moved to the ,circumferentially around the periphery thereof, right or left as the case may be. As shown in Figin side by side relation, a plurality of semi-circuure 2 of the drawings, the table is moved to the `lar shaped grooves 30 which are adapted to pro- I right and in so doing the square shaft 20 will be vide roll passes for the product to be formed when moved through lthe floating bearing element I9 the rolls are mounted in a rolling mill in a manand the bevel gear 2| so that the bevel gears 2l ner well known to those skilled in the art. In i and 22 are at all times meshed with each other.

f `order to4 cut a plurality of spiral grooves in the In the full line position ofthe roll 29 in Figure `grooves 30 of the roll, there is mounted on the 1, the arbor 5 together with the cutter 3| rearbor '5 of the milling machine, a cutter 3| which 70volves in a plane parallel to the axis of said roll is adapted, of Icourse,'to be rotated with the arbor. and, at the same time, the work roll is rotated by If it is desired to cut double spiral grooves in the the arbor at a predetermined ratio to that of the `periphery of the grooves 39, as in the present in- 1 rotating cutter.'I In order for the cutter 3I to folstance, there is provided a cutter having two sublow inthe same spiral groove on the second and l stantiallyradial teeth 32 which are spaced 180 I5 each succeeding revolution of theroll, it will -be DiameterX 1r equals the ratio of the cutter to the R. P. M. of the roll, wherein, S is the space between the double spiral grooves and the diameter is approximately that of the outside diameter of thel work roll. By revolving the roll at the above ratio with reference to the revolution of the cutter, it will be seen that the spiral grooves are cut gradually deeper upon eah revolution of the roll.

It has been found that in cutting spiral grooves in' the grooves of two newly sized work rolls, namely, 121/2 so las, to roll eight sizes of reinforcing barsfrom ff/ of an inch to 1% inches in diameter, that the reduction ratio varies from 88 to 1 maximum, to 44 to l minimum. Thus a reduction gear having inches and 10% inches in diameter,Y

a 44 to 1 ratio combined with a variable speed reducer` with the range of from 1 to 1` to 2 to 1 may be. used to produce any ratio between 44 to 1 and 88 to 1. An alternate means for obtaining such a ratio requires four sets of bevel gears to provide a 2 to 1 ratio with suitablesteps combined with a 44 to 1 reduction gear. A second alternate l method for obtaining such a ratio is to use a spur gear or a combination spur and bevel gears.

It will be understood that after the spiral grooves 36 have been cut inthe grooves 30 of the work rolls, by means of the apparatus of the present invention, that the rolls 29 are then assembled in a rolling mill in a manner shown in Figure '1 of the drawings, with the grooves disposed oppol site each other so as to provide a roll pass for the reinforcing bars between the rolls. The bars are then passed through the roll passes of the rolls and a finished reinforcing bar 31 is provided, as shown in Figures 8 through 10 of the drawings. There is formed on such a reinforcing bar by the rolls 29, a plurality of double spiral lugs 33 which are spaced equi-distant apart throughout the length of the bar. It will beseenthat there -is also formed on the reinforcing bar 31, a pair of longitudinally extending ribs 34 which bisect vthe spiral grooves 36. In other words, there is formed two longitudinally extending ribs with one positioned to the either side of the bar, i. e., diametrically opposed. In order to form such a longitudinally extending rib 34 on each side of the l Number reinforcing bar, it will be understood that th outer edges of each of the grooves 30 in the wor roll 29 are relieved or cut away as at 35, as show in Figures 6 and 7 of the drawings. To provi e such a construction, it will be seen that the e s of the spiral grooves 36 terminate at the relie ed f portions 35 and do not extend to the outer surf ce of the roll.

I'he grooves 3S cut in the manner hereinbe ore described with the roll 23 disposed in the full line position of Figure 1, may be characterized as having equal pitch and lead, the cutter 3| forming said groovesbeing rotated in the plane of the axis of said roll. When itis desired to vary such relation to produce spiral grooves having a lead greater than their pitch, the roll 29 may be disposed at an angle to the plane of said cutter in the manner indicated by the dotted line vposition in Figure 1, causing cutter 3l' to be at an angle to the roll axis. It will be understood the universal joint 26a and by adjusting the position of bearing members 21 upon the table l.

While we have shown and described one specific embodiment of our invention, it will be understood that this embodiment is merely for the purpose of illustration and description and that various other forms may be devised'within the scope of our invention, as defined in the appended claim.

We claim:

In combination with a milling machine having a rotatable arbor and a table'for supporting a .circumferentially grooved work roll, a cutter on said arbor, bearing members on said table for rotatably supporting the work roll with the cutter engaging a circumferential groove thereof, drive means for rotating said arbor and; cutter, and means arranged between said driv means and one end of the .work roll for rotatil` g .the roll a predetermined distance upon each revolution of said cutter, said bearing members being adjustable on said table to vary the angle between the plane ofthe cutter and the axis of the work roll. y

WILLIAM T. FmLns. EDGAR M. nf. HEnoLD.

\ ArunusmiNcles errno le of this patent:

UNITED STATES PATENTS Name Date 1,128,613 Lanchester L Feb. 16, 1915 1,751,540 Cone Mar. 25, 1930 606,837 Gibson July 5. 1898 

